function s1_hello(){
 echo "hello,world!"
}

function s2_tell_who_i_am(){
 echo "$(whoami)"
}

function s3_which_distro_do_i_use(){
 cat /etc/*-release | grep "^NAME"
}

function s4_view_my_cpu_arch(){
 uname -m
}

function s5_show_first_scsi_disk_size(){
lsblk -l |\grep disk |\grep '^sda' |\awk '{print $4}'| tr -d 'G'
}

function s6_show_main_memory_size_in_megabytes(){
free -m | grep "Mem:" |awk '{print $2}'
}
